Humidifier



FIG. 1 is a top and front perspective view of a humidifier showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a rear elevational view thereof, the side elevations being identical in appearance; and

FIG. 5 is a bottom plan view thereof.

The vertical lines on the middle and lower portions in FIGS. 1, 2 and 4 are to indicate contrast between the surfaces. 

The ornamental design for a humidifier, as shown and described. 